The Nvidia drivers in question are not the video driver but the motherboard chipset drivers.
Just to clarify further, nor are the network drivers in question ..... at this stage anyway.
Once (IF) I can scavage the drivers from my working 64bit build of 15063.483 and then get a clean install from the DVD ISO of the 64bit build 15063.0 it remains to be seen if the graphic card and the onboard ethernet drivers actually work!
Great fun!
Cheers